NEW
Font size
S
M
L
XL
WorksheetsGenetics Review
Total questions: 43
Worksheet time: 2hrs 9mins
Name
Class
Date
1.
which is heterozygous ?
a)
Tt
b)
TT
2.
Which is homozygous ?
a)
Zz
b)
SS
3.
the genetic makeup of an organism
a)
heterozygous
b)
punnet square
c)
genotype
4.
A homozygous dominant dog with brown fur is crossed with a heterozygous dog with brown fur. What are the percentages of the possible genotypes?
a)
100% BB
b)
75% BB and 25%Bb
c)
50 % BB and 50% Bb
d)
50% Bb and 50% bb
5.
Squidward has light blue skin, and his genotype for this trait is Bb. Would Squidward be considered a purebred or hybrid for light blue skin?
a)
Purebred
b)
Hybrid
6.
An offspring will receive how many alleles from each parent to determine a specific trait?
a)
one
b)
two
c)
three
d)
five
7.
Which of the following is a phenotype?
a)
BB
b)
Bb
c)
bb
d)
Blue eyes
8.
What is a phenotype
a)
The genetic make up (code)
b)
The physical trait
9.
Two brown eyed parents (Bb) have a baby. What is the chance the baby is blue eyed?
a)
0 %
b)
25%
c)
50%
d)
75%
10.
G = green, g = yellow
The genotype for a yellow plant is...
The genotype for a yellow plant is...
a)
GG
b)
Gg
c)
gg
d)
all of the choices result in yellow
11.
An allele whose trait only shows up when no dominant allele is present.
a)
hidden allele
b)
dominant allele
c)
recessive allele
d)
present allele
12.
Two heterozygous (Tt) tall pea plants are crossed. Which describes their offspring?
a)
50% tall and 50% short
b)
75% tall and 25% short
c)
100%short
d)
75% short and 25% tall
13.
A heterozygous yellow pea plant's genotype would be:
a)
YY
b)
yy
c)
Yy
d)
Yg
14.
What does heterozygous mean?
a)
An organism that has the same genes for a trait (TT or tt)
b)
An organism that has different genes for a trait (Tt)
c)
When neither gene is fully dominant; offspring is a mixture of both
d)
the different forms of a trait (hair color--> brown, blonde, red
15.
The letters that make-up the genetic code for a trait
a)
genotype
b)
heterzygous
c)
phenotype
d)
trait
16.
---- Is the combination of two alleles that are the same
a)
genotype
b)
homozygous
c)
phenotype
d)
trait
17.
----is the type of gene that always shows itself when present
a)
genotype
b)
homozygous
c)
phenotype
d)
dominant
18.
Look at the Punnett Square. What's the probability of having the recessive offspring?
a)
100%
b)
75%
c)
50%
d)
25%
19.
A section of the DNA strand that determines a specific trait
a)
gene
b)
trait
c)
chromosome
d)
allele
20.
Tallness is dominant in pea plants and is represented by "T." What would the genotype be for a homozygous tall plant?
a)
Tt
b)
tt
c)
TT
d)
Tall
21.
If red flowers (R) are dominant over white, what is the probability that the offspring will be red?
a)
1 out of 4
b)
2 out of 4
c)
3 out of 4
d)
4 out of 4
22.
What is NOT a possible offspring genotype?
a)
BB
b)
Bb
c)
bb
23.
What is the missing genotype?
a)
BB
b)
Bb
c)
bb
d)
bB
24.
Look at the diagram. The alleles for parents are missing. The parents have which of these alleles.
a)
DD and Dd
b)
Dd and dd
c)
DD and dd
d)
Dd and Dd
25.
Two brown eyed parents (Bb) have a baby. What is the chance the baby is blue eyed?
a)
0 %
b)
25%
c)
50%
d)
75%
26.
Passing of traits from one generation to the next
a)
Heredity
b)
Genetics
c)
Inheritance
d)
Allele
27.
Scientific study of how traits are passed to offspring through genes
a)
Heredity
b)
Genetics
c)
Inheritance
d)
Allele
28.
Alternate form of a gene for a single trait; may be dominant or recessive
a)
Heredity
b)
Genetics
c)
Inheritance
d)
Allele
29.
one set of instructions for an inherited trait
a)
heredity
b)
allele
c)
trait
d)
gene
30.
A chart that shows all the possible combinations of alleles that can result from a genetic cross
a)
Gene
b)
Pedigree
c)
Punnett Square
d)
Dominant
31.
The chance of something happening is called
a)
Probability
b)
Luck
c)
the odds
d)
Chance
32.
What percentage of the offspring will have this recessive disease?
a)
0%
b)
25%
c)
50%
d)
75%
33.
I have 2 X chromosomes. What am I?
a)
Male
b)
Female
34.
I have 1 X chromosome and 1 Y chromosome. What am I?
a)
Male
b)
Female
35.
This type of inheritance pattern shows BOTH traits in possible offspring
a)
complete dominance
b)
incomplete dominance
c)
co-dominance
d)
dominant pattern
36.
What do the letters nn represent?
a)
recessive genes
b)
dominant genes
c)
heterzygous genes
d)
homozygous genes
37.
What are the letters Ss and example of ?
a)
homozygous genes
b)
domianant genes
c)
heterozygous genes
d)
recessive genes
38.
Long tails in monkeys (L) is dominant to short tails (l). What are the percentages of genotypes if you cross a homozygous dominant monkey with a homozygous recessive monkey.
a)
50% LL 50% ll
b)
50% LL and 50% Ll
c)
75% LL and 25% Ll
d)
100% Ll
39.
Which of the following is NOT an example of a genotype?
a)
RR
b)
Rr
c)
rr
d)
long
40.
What is the phenotype of a bird which the genotype Bb?
B-blue b-red
B-blue b-red
a)
blue
b)
red
41.
Scientist call an organism that has two different alleles for a trait a(n)
a)
trait
b)
factor
c)
purebred
d)
hybrid
42.
The expression or the actual physical characteristics are known as _________.
a)
Phenotypes
b)
Genotypes
c)
Alleles
d)
DNA molecules
43.
_________________ are different forms of the same gene.
a)
Genes
b)
Chromosomes
c)
DNA
d)
Alleles
Reset
